//按钮事件
var btn=document.querySelector(".navbar-toggler");
var ul1 = document.querySelector(".Right");
var b = 1;
btn.onclick = function() {
    if (b == 1) {
        ul1.style.display = 'block';
        b = 2;
    } else {
        ul1.style.display = 'none';
        b = 1;
    }
}